Name the span of years that saw the greatest expansion of the muslim empire?

After the death of Muhammad, he was succeeded by 'the Rashidun', a 30-year reign of the four 'rightly guided caliphs'. During such reign, which lasted from 632 CE to 656 CE, the expansion through the territories outside Arabia started.

Eventually, under the influence of the political systems of these territories, the leadership became hereditary, and the Umayyad dinasty, who moved to Damascus to excercise power, ruled from 661 CE to 750 CE. This dinasty achieved the greatest expansion of the Muslim Empire in a lapse of 89 years, converting the Caucasus, Transoxiana, Sindh, the Maghreb, and the Iberian Peninsula to Islam, as well as occupying 5.79 million square miles of territory and including 62 million people. It was the fifth largest empire in history regarding area and proportion of the world's population.

well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.

marginal cost is a microeconomic measure that us to evaluate the extent to which the level of production of a good is sustainable in accounting, that is, to how many quantities the company plans to profit from the production of the good.

the concept of marginal cost is simple, it means the cost of producing one more item. for example, in the case of pies, the marginal cost is the cost of producing one more pie than those that have already been produced.

it is important to understand that productive activity influences marginal cost. the marginal cost of some goods can be very high, while others may be insignificant. for example, the marginal cost of producing an extra plane is very high. already the marginal cost of a water company to provide 1l more water is derisory.

in the case of pies, the cost involves the inputs, the labor and the fixed cost, which involves the fixed space of the bakery. the level of production initially has the marginal cost decreasing because there is space and manpower available. however, to produce more you have to hire more workers and buy more inputs. if physical space is limited, workers will conflict with places, inputs and their productivity will decrease, meaning there is an optimum point of production for each level of space and manpower. from this point on, the productivity of the workers will be getting smaller because of lack of space, so that the marginal cost of producing one more pie will be increasing. so, although you have not posted the chart, but if you have the answer, you can see that my explanation goes according to the marginal cost curve that will increase from the 4th pie, answer (c).